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J. H. P. BURCHETT.

INTERNAL COMBUSTION ENGiNE. APPLICATION FILED SEPT. 26. l9l 7. 313,578,Patented Aug. 19,1919.

fwmxq j Mma V o on'n 'nrumr PYNE :enncnnrr, or new GARDENS, Enema-m).

To all'cukom it may concern:

Beit known that 1,JOHN HILARY Prxn BURGHETT, Of 38 Mort-lake road, KewGardens, in the countyof Surrey, En land, have. invented certain newanduseful Improvements in or Relating to Internal-Combustion Engines, ofwhich the following is a specification.

This invention relates to internal combustion engines of the two stroke.ty e. The object of the invention is to provi e an im proved engine ofthis type.

A two stroke'internal combustion engine made in accordance with thisinvention comprises a power cylinder, a crank case, a compressioncylinder of larger diameter than the power cylinder disposed between thepower cylinder and the crank case, said compression cylinder beingprovided for the purpose of containi-n air or a mixture of air and fuel,which is subsequently forced into the power cylinder, a art thereofbeingat the same time utilized or admitting fuel into the power cylinder, anda piston, said pistonbeing provided at one end with a collar adapted towork with compression cylinder, while the other end works in the powercylinders, packing rings being provided' at each end. Said collar beingprovided for the purpose of forcing the air or mixture of air and fuelcontained in the compression cylinder into the power cylinder,

" during the whole of the period in which the I piston is travelingtoward the head of the cylinder. A sliding sleeve provided 'withanannular cavity .is disposed internally on the trunk of thefpistonbetween the two ends and ports are provided in the trunk of the pistonwhich are covered and uncovered and connected together by the slidingsleeve. Said ports and annular cavity being provided for the purpose ofleading the air or mixture of air and fuel contained in the compressionc linder into the power cylinder during centa e of the instroke, theresidueof air contained in the compression cylinder in the latter casebeing then utilized for admitting fuel into the power. cylinder towardthe end of the 'instroke in a manner hereinafter described. Means areprovided for moving the sleeve in relation to the piston.

The drawing filed herewith is a diagrammatic section of one form ofengine made in accordance with this invention.

a is the power cylinder, 6 the compressi n either the whole, or apredetermined:per-J m'r nnnnn-comnus'rron ENGINE.

Specification of Letters Patent. Pat ented'Au g'. 19, 1919- Appllcationflled September 26, 19 7. Serial No. 193.300.

cylinder, 0 the crank case. One end d of the piston works in the powercylinder a and the collar 6 on the other end works in the compressioncylinder-1b. In the trunk f of the piston are disposed inlet ports 9 and9' adapted to be covered and uncovered and connected by a sliding sleeveh. In the sleeve h is a channel It adapted toconnect the ports g and g.In the piston dis an annular passage d and ports d? adapted to connectthe cylinder 6 to the cylinder a. On the sleeve h is a rack 7'. On thesmall end of the-connecting rod is is a toothed segment m which gearswith the rack j. n is theexhaust port. 0 is a scavenging air portconnecting with the crank case 0. In the crank case is disposed anon-return valve 1?.

The direction of rotation is indicated by the arrow. In the drawin theiston and sleeve are shown in the position t e would occupy on the powerstroke with t e inlet port g open and the port g closed. In operationduring the outstroke air or carbureted mixture is admitted from thecrank case to the cylinder 1) through the port 9. Toward the end of theoutstroke, the sleeve H is moved by means of the segment m and rack 1'so as to place the channel h in communication with the port 9, therebyclosing this port to the crank case and placing it in coma port g andthe anat uncovered by the pistonht'the end of the power stroke.Compressed air or carbu- .reted mixtureis at the same time admittedthrough the port 0 on the opposite side ot the cylinder for the purposeof assisting 1n the expulsion of the exhaust gases. A spring-pressedvalve 8 is disposed between the chamber R and. the top'of the powercylinder a. a

In the form of engine shown in the drawing herewith, the port 9 is soarranged as to be closed by the walls of the power cylinder a pedetermined moment prior to the completion of the instroke, and the airthereby entrapped in' the compression cylinder is compression cylinder12, and a chamber R adapted to receive fuel through the fuel inlet It Aspring pressed valve S is disposed between the chamber R and the top ofthe power cylinder a. 'From the chamber R is a'duct or ducts 7' leadingto jetsin the seating of the non-return spring pressed valve 8. From thechamber R is a pipe or channel t leading to the top of the compressioncylinder bk In operation, the fuel is 'fed under high pressure to thechamber R and when ,the ports in the trunk piston are covered towardtlie end of the instroke by the walls of the-powercylinder,the'remainder of the air in the compression cylinder is forcedthrough the pipe t, causing the non-return valve 8 to open and allowsome fuel. to pass through the ducts r and jets into the power cylinder.

Regulation is effected either by. varying the pressure in the fuelreservoir or by closing more or less of the jets throughwhich the oil isforced, or the fuel may be in-.

jected by any other suitable arrangement dependingeither upon a directoil pump or a high pressure oil reservoir with amechani- 'cally operatedinjection valve. Or for sufficiently volatile oils a carbureter may beemployed disposed in such a'manner that the air drawn into the crankcase through the non-return valve p must pass first through saidcarbureter.

It is evident that by suitably proportioning the relative diameters ofthe cylinders a and b and provided the clearance around the sleeve h andbetween the end a of the piston and the cylinder are reduced to aminimum, it wouldbe possible to squeeze into the cylinder a whateverquantity of new air or mixture might-be foundmost suitable and dependingin any particular case upon whether efficiency of fuel consumption orpower per unit weight of engine was the more important consideration.

What I claim as m invention and desire tosecure by Letters atent is Atwostroke cycle internal combustion engine comprising a power cylinder, acrank case, a compression cylinder, oflar er diametcr than the powercylinder, disposed between the power cylinder and the crank case, saidcompression 0 linder bcing provided for the purpose. 0 remaking air or amixture of air and fuel which is forced into the power cylinder and apart of which is utilized for forcing fuel into the power cylinder, atrunk piston workin in said cylinders, said piston being provided withpacking rings at each end, one end working in the power cylinder and theother end being rovided with a collar adapted to workin t e compressioncylinder, said collar being provided for the purpose of. forcin the airor mixture of air and fuel contains in the compression cylinder into thepower cylinder, ports in said piston, a sleeve in Said piston, a channelin said sleeve adapted to connect the ports in said piston; S8 1d portsbeing provided to lead theliiirr contained in the compressioncylind'ej'ato the power cylinder during the major Iliart of the'instroke, and means for moving the sleeve, in relation to said piston.

2. A two stroke cycle internal combustion engine comprising a powercylinder, a crank case,acompression cylinder, of larger diameter than,the power cylinder, disposed between the power cylinder aridthe crankcase; said compression 0 linder being 'provided for the purpose 0containing air or 'a mixture of air and fuel which is forced into thepower cylinder, and a part utilized for forcing fuel into the powercylinder, a trunk piston working in said cylinders, said piston bein,provided with packing rings at each on one end workin power cylinderand the. other end beln provided with a collar adapted to work mthecompression cylinders, said collars being provided for -the urpose offorcing the air or mixture of alr and fuel contained in the compressioncylinder into the power cylinder ports in said piston, a sleeve in saidpiston, a channel in said sleeve adapted to connect the ports in saidpiston, said ports being provided to lead the air contained in thecompression cylinder .to the power cylinder during the major part of theinstroke, meansfor moving the sleeve in relation to the piston, fueladmission jets at the top of the power cylinder and means for injectingfuel throu h said jets.

3. A two stroke cyc e internal combustion engine comprising a powercylinder, a crank case, a' compression cylinder of larger'diameter thanthe power c linder disposed between the power cylin er and the crankcase, said compression cylinder be ing provided for the purpose ofcontaining air or a mixture of air and fuelwhich is forced into thepower cylinder and a part utilized for forcing fuel into the powercylinder,\ a trunk piston working in said cylinders, 'saidpiston beingprovided with packing rings at each end, one end work- -1ng 1n the powercylinder and the other end being provided with a collar adapted to workin the compression cylinder, said c0llar being provided for the purposeof forcing the air or mixture of air and fuel con-. tained in thecompression cylinder into the power cylinder ports in said piston, asleeve in said piston, a channel in said. sleeve in the adapted toconnect, the ports in said piston, said ports being provided to lead theair contained in the compression cylinder to the power cylinder duringthe major part of the instroke, means for moving the sleeve in. relationto said piston, a plug disposed in a cavity at the top of said powereylin der, said plug being provided with a eha1nher adapted to receiveair and a chamber adapted to receive fuel, means for admitting fuelunder pressure to said fuel cavity, a spring pressed non-return valve insaid air chamber, ducts from said oil chamber to the seating of saldvalve and a duct from said chamber to thetop of the"con1pression 16cylinder.

In witness whereof, I have hereunto signed my name in the presence oftwo subscribing Witnesses.

lQHN HILARY PYNE BURCHETT.

Witnesses:

ALFRED B. CAMPBELL, REGINALD EATON ELLIS.

